Requirements for IPv6 Customer Edge Routers to Support IPv4 Connectivity as-a-Service
2018
This document specifies the IPv4 service continuity requirements for
an IPv6 Customer Edge (CE) router, either provided by the service
provider or by vendors who sell through the retail market.
Specifically, this document extends the "Basic Requirements for IPv6
Customer Edge Routers" (RFC7084) in order to allow the provisioning of
IPv6 transition services for the support of "IPv4 as-a-Service"
(IPv4aaS) by means of new transition mechanisms. The document only
covers transition technologies for delivering IPv4 in IPv6-only access
networks, commonly called "IPv4 as-a-Service" (IPv4aaS). This is
necessary because there aren't sufficient IPv4 addresses available
for every possible customer/device. However, devices or applications
in the customer LANs (Local Area Networks) may be IPv4-only or
IPv6-only and still need to communicate with IPv4-only services at the
Internet.
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